<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category    ZendX
 * @package     ZendX_JQuery
 * @subpackage  View
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license     http://framework.zend.com/license/new-bsd     New BSD License
 * @version     $Id: Slider.php 20165 2010-01-09 18:57:56Z bkarwin $
 */
/**
 * @see ZendX_JQuery_View_Helper_UiWidget
 */
require_once "ZendX/JQuery/View/Helper/UiWidget.php";
/**
 * jQuery Slider View Helper
 *
 * @uses 	   Zend_Json
 * @package    ZendX_JQuery
 * @subpackage View
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class ZendX_JQuery_View_Helper_Slider extends ZendX_JQuery_View_Helper_UiWidget
{
    /**
     * Create jQuery slider that updates its values into a hidden form input field.
     *
     * @link   http://docs.jquery.com/UI/Slider
     * @param  string $id
     * @param  string $value
     * @param  array  $params
     * @param  array  $attribs
     * @return string
     */
    public function slider ($id, $value = null, array $params = array(), 
    array $attribs = array())
    {
        if (! isset($attribs['id'])) {
            $attribs['id'] = $id;
        }
        $jqh = ZendX_JQuery_View_Helper_JQuery::getJQueryHandler();
        $params = $this->initializeStartingValues($value, $params);
        $handleCount = $this->getHandleCount($params);
        // Build the Change/Update functionality of the Slider via javascript, updating hidden fields. aswell as hidden fields
        $hidden = "";
        if (! isset($params['change'])) {
            $sliderUpdateFn = 'function(e, ui) {' . PHP_EOL;
            for ($i = 0; $i < $handleCount; $i ++) {
                // Js Func
                if ($i === 0) {
                    $sliderHiddenId = $attribs['id'];
                } else {
                    $sliderHiddenId = $attribs['id'] . "-" . $i;
                }
                $sliderUpdateFn .= $this->getChangeCallback($jqh, 
                $sliderHiddenId, $attribs['id'], $i);
                // Hidden Fields
                $startValue = $this->getHandleValue($i, $params);
                $hiddenAttribs = array('type' => 'hidden', 
                'id' => $sliderHiddenId, 'name' => $sliderHiddenId, 
                'value' => $startValue);
                $hidden .= '<input' . $this->_htmlAttribs($hiddenAttribs) .
                 $this->getClosingBracket() . PHP_EOL;
            }
            $sliderUpdateFn .= "}" . PHP_EOL;
            $params['change'] = new Zend_Json_Expr($sliderUpdateFn);
        }
        $attribs['id'] .= "-slider";
        if (count($params) > 0) {
            $params = ZendX_JQuery::encodeJson($params);
        } else {
            $params = '{}';
        }
        $js = sprintf('%s("#%s").slider(%s);', $jqh, $attribs['id'], $params);
        $this->jquery->addOnLoad($js);
        $html = '<div' . $this->_htmlAttribs($attribs) . '>';
        for ($i = 0; $i < $handleCount; $i ++) {
            $html .= '<div class="ui-slider-handle"></div>';
        }
        $html .= '</div>';
        return $hidden . $html;
    }
    protected function getChangeCallback ($jqh, $sliderHiddenId, $elementId, 
    $handlerNum)
    {
        if (version_compare($this->jquery->getUiVersion(), "1.7.0") >= 0) {
            return sprintf(
            '    %s("#%s").attr("value", %s("#%s-slider").slider("values", %d));' .
             PHP_EOL, $jqh, $sliderHiddenId, $jqh, $elementId, $handlerNum);
        } else {
            return sprintf(
            '    %s("#%s").attr("value", %s("#%s-slider").slider("value", %d));' .
             PHP_EOL, $jqh, $sliderHiddenId, $jqh, $elementId, $handlerNum);
        }
    }
    protected function getHandleCount ($params)
    {
        if (version_compare($this->jquery->getUiVersion(), "1.7.0") >= 0) {
            return count($params['values']);
        } else {
            return count($params['handles']);
        }
    }
    protected function getHandleValue ($handleNum, $params)
    {
        if (version_compare($this->jquery->getUiVersion(), "1.7.0") >= 0) {
            return $params['values'][$handleNum];
        } else {
            return $params['handles'][$handleNum]['start'];
        }
    }
    protected function initializeStartingValues ($value, $params)
    {
        $values = array();
        if (isset($params['value'])) {
            $values[] = $params['value'];
            unset($params['value']);
        } else 
            if (isset($params['values'])) {
                $values = $params['values'];
                unset($params['values']);
            } else 
                if (isset($params['handles'])) {
                    for ($i = 0; $i < count($params['handles']); $i ++) {
                        $values[] = $params['handles'][$i]['start'];
                    }
                    unset($params['handles']);
                } else 
                    if (isset($params['startValue'])) {
                        $values[] = $params['startValue'];
                        unset($params['startValue']);
                    } else 
                        if (is_numeric($value)) {
                            $values[] = $value;
                        }
        if (version_compare($this->jquery->getUiVersion(), "1.7.0") >= 0) {
            $params['values'] = $values;
        } else {
            $params['handles'] = array();
            for ($i = 0; $i < count($values); $i ++) {
                $params['handles'][$i]['start'] = $values[$i];
            }
        }
        return $params;
    }
}